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Project 02 / 16

SoloYap

Realtime voice English tutor — practice spoken English with an AI partner over scenarios like ordering coffee, doctor visits, and salary negotiation, with grammar corrections after every turn.

Open live site
SoloYap realtime English speaking practice workspace

What I built

  1. 01

    Built the realtime voice loop on OpenAI's Realtime API over WebRTC; instant grammar corrections and better-phrasing suggestions stream back after every learner turn

  2. 02

    Authored 13 CEFR-graded scenarios (A2–C1) plus free-chat and custom-topic modes, with optional Mandarin/Cantonese native-language hints to lower the floor for beginners

  3. 03

    Shipped as an installable PWA with manifest + apple-touch icons; layered cost protection via per-IP rate limits, session caps, and an email-allowlist request-access flow